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Refractometer, Coolant and Electrolyte Meter A refractometer, essential in every workshop, is a device that allows you to determine the physical properties of liquids by measuring the refractive index at the boundary of the medium. Professional refractometer for measuring operating fluids in cars, trucks and buses. It is designed to determine the freezing point of washer fluid, propylene glycol and ethylene glycol coolant. It also provides a range of electrolyte densities. The kit includes a sampling pipette and cleaning cloth. Everything is packed in a convenient box. The set includes: Three-scale refractometer. Sturdy, convenient case with a sponge. Pipette for collecting liquid and applying it to the observation glass. Microfiber cloth for cleaning the observation glass and lens.